/*
   testrep11.cpp
   CIS 150
   6/10/2008
   David Klick
  
   Data validation using a loop. Both a priming read
   and an alternative technique are used.
*/

#include <iostream>
using std::cin;
using std::cout;

void cont();

int main() {
   int length;   // length of room
   int width;    // width of room
   int area;     // area of room
   
   // get length of room - priming read
   cout << "Enter length of room in inches (1 - 9999): ";
   cin >> length;
   
   // validate length - request again if invalid
   while (length<1 || length>9999) {
      cout << "Error: Invalid length.\n";
      cout << "Enter length of room in inches (1 - 9999): ";
      cin >> length;
   }
   
   // get width of room - not priming read
   do {
      cout << "Enter width of room in inches (1 - 9999): ";
      cin >> width;
      if (width<1 || width>9999) {
         cout << "Error: Invalid width.\n";
      }
   } while (width<1 || width>9999); // repeat if invalid
   
   // calculate and display area of room
   area = length * width;
   cout << "The area of the room is " << area << " square inches"
        << " (" << (area/144.0) << " square feet)\n";

   cont();
   return 0;
}

void cont() {
   if (cin.rdbuf()->sungetc() != -1 && cin.get() != '\n') cin.ignore(80,'\n');
   cout << "Press enter to continue...";
   cin.get();
}

/*
   Sample output:

   Enter length of room in inches (1 - 9999): 246
   Enter width of room in inches (1 - 9999): -10
   Error: Invalid width.
   Enter width of room in inches (1 - 9999): 0
   Error: Invalid width.
   Enter width of room in inches (1 - 9999): 12000
   Error: Invalid width.
   Enter width of room in inches (1 - 9999): 180
   The area of the room is 44280 square inches (307.5 square feet)
*/